Fuses are saftey devices - when the current flowing is too high, the fuse 'blows' cutting the circuit off
Circuit Breakers serve the same purpose but instead of replacing a fuse, circuit breakers can be easily reset
Double Insulation is when an appliance has a thick coating of an insulating material (plastic) to protect user from touching any electrical parts. Earth wire not needed
Live Wire - Provides path so electrical energy can flow (ac)
Neutral Wire - Completes the circuit
Earth Wire - Safety device
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